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    <title>短语元素</title>
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    <p name="p">em标签告诉浏览器把文本表示为强调的内容<em>用斜体来显示。</em></p>
    <p>strong强调的程序更强一些,<strong>用粗体的字来显示。</strong></p>
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        <code>
            <pre>
            PI = 3.1415925
            r = int(input('r='))  # 请输入 <kbd>100</kbd>,其中变量<var>r</var>表示圆的半径
            s = PI * r **2
            print('s=',s)
        </pre>
        </code>
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    <p>
        She said <q>I didn't Know.</q>
    </p>
    <p>
        一打有<del>20</del> <ins>12</ins>件。
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